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/*
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Author: Cameron Shorter cameronAtshorter.net
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License: LGPL as per: http://www.gnu.org/copyleft/lesser.html
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$Id: CollectionList.js 3888 2008-02-27 18:25:45Z ahocevar $
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*/
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// Ensure this object's dependancies are loaded.
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mapbuilder.loadScript(baseDir+"/widget/WidgetBaseXSL.js");
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/**
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* A widget to display a list of context docs to pick from. This is a view of
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* a Context Collection as specified in the OGC Context specification.
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* The default xsl stylesheet for this widget also uses the switchMap
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* function, which allows to switch to a different map context.
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* @constructor
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* @base WidgetBaseXSL
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* @param widgetNode The widget's XML object node from the configuration document.
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* @param model The model object that this widget belongs to.
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*/
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function CollectionList(widgetNode, model) {
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WidgetBaseXSL.apply(this,new Array(widgetNode, model));
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/**
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* Switch to another map context, keeping the current extent.
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* @param objRef this widget
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* @modelUrl the URL of the context we want to switch to.
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*/
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this.switchMap = function(objRef, modelUrl) {
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// save the current extent
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objRef.extent = objRef.targetModel.map.getExtent();
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objRef.srs = objRef.targetModel.getSRS();
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objRef.scale = objRef.targetModel.map.getScale();
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objRef.targetModel.addListener( "loadModel", objRef.setExtent, objRef );
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config.loadModel( objRef.targetModel.id, modelUrl );
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}
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/**
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* Sets the extent of the map that we just switched to.
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* Called when the map is reloaded with the new context.
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* @param objRef this widget
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*/
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this.setExtent = function (objRef) {
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objRef.targetModel.removeListener( "loadModel", objRef.setExtent, objRef );
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var bbox = objRef.extent.toBBOX().split(/,/);
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if (objRef.targetModel.getSRS().toUpperCase() != objRef.srs.toUpperCase()) {
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var targetProj = new OpenLayers.Projection(objRef.targetModel.getSRS());
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var srcProj = new OpenLayers.Projection(objRef.srs);
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var ptLL=new OpenLayers.Geometry.Point(bbox[0],bbox[1]);
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var ptUR=new OpenLayers.Geometry.Point(bbox[2],bbox[3]);
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ptLL.transform(srcProj, targetProj);
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ptUR.transform(srcProj, targetProj);
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objRef.extent = new OpenLayers.Bounds(ptLL.x, ptLL.y, ptUR.x, ptUR.y);
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}
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if (objRef.targetModel.map.getExtent().containsBounds(objRef.extent, false, false)) {
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objRef.targetModel.map.zoomToExtent(objRef.extent);
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if (!objRef.targetModel.map.fractionalZoom && objRef.targetModel.map.getScale() > objRef.scale) {
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objRef.targetModel.map.zoomIn();
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}
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}
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}
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}
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